The government have done a U-turn and are now supporting greater European integration instead of opposing it.
A turn in a vehicle carried out by driving in a semicircle in order to travel in the opposite direction
If you make a U-turn when you are driving or cycling, you turn in a half circle in one movement, so that you are then going in the opposite direction
disapproval If you describe a change in a politician's policy, plans, or actions as a U-turn, you mean that it is a complete change and that they made the change because they were weak or were wrong. a humiliating U-turn by the Prime Minister